This QST article from 1994 was co-authored by N6BV with K1VR and may be of interest. The file can be downloaded from my Google Drive in the link below: https://drive.google.com/file/d/1S0hKxkov9RZx5
It may be worthwhile to consider installing a pair (or multiples) of vacuum relays on the open line, outside the house, to function as a DPST knife switch. Relay closure is controlled inside the ham
P.S. A photo of the first RS8 relay pair can be seen in the upper-left corner of my outside ATU. https://www.qrz.com/db/W9AC#BALANCED%20TRANSMATCH Paul, W9AC It may be worthwhile to consider installi
I indicated that a suppressor could still be used with vacuum relays -- to your point, if required to satisfy a code provision. Nothing should prevent the use of vacuum relays together with a UL sup
Right. You're then in the same league as the major industrial players who supply whole-facility surge protection devices and need ample indemnity protection when either the device fails to protect o
Performance of the W7FG dipole (aka Dipole-Doublet and CF Zepp) is relative, as shown by Cebik in the PDF attachment. The radiation pattern will be more complex and less predictable than on resonant
The PDF file is also linked from my Google Drive: https://drive.google.com/file/d/1SauvrwkWudTpODWjsXW84PU_-4W9Fqhf/view?usp=sharing Paul, W9AC _______________________________________________ ______
All antennas are mechanical and often break at the worst time. At least if an ATU fails, it's at ground level and conveniently fixed. Coaxial-fed dipole antenna center insulators often break and coa
Like this one: https://tune-a-tenna.com/ Advantage: allows a 1/2 wave azimuth pattern on all bands or even variable patterns if desired by adjusting antenna element length. It also solves the probl
I have a graveyard of 7-8 prop pitch rotators, all awaiting rebuilds one day. In each case, failure resulted from water ingress, not mechanical stress. As an experiment, a new method was tried: a sil
https://www.mcmaster.com/products/silicone/rubber-1~/high-temperature-silicone-rubber-sheets-bars-and-strips-6/ Item # 1460N34 Pricy, but not as pricy as a $2,500 prop pitch rebuild. Being silicone-
P.S. The sheet overlap is held together with Dow Corning 736 heat-resistant RTV sealant. Paul, W9AC https://www.mcmaster.com/products/silicone/rubber-1~/high-temperature-silicone-rubber-sheets-bars-a
Recall that Kirchoff's Law was used by some antenna experts to challenge W9UCW's result. In particular, the main concern was that placement of the RF ammeters inside the coil ends perturbed the measu
A few potential problems come to mind, all of which have been documented in the literature for decades: 1) Unintended line radiation; 2) Directional antenna pattern distortion; 3) Inaccurate SWR mea
Keep in mind that on any given band, the T12's gain is roughly equal to a two-element Yagi on a very short boom. Boom length is what supplies Yagi gain. When modeling the T12 in 4Nec2 or EZNec, you'
I raised this issue back in 2019. Some reply comments: http://lists.contesting.com/archives//html/Towertalk/2019-01/msg00140.html Paul, W9AC Ground reflection and diffraction at any azimuth angle ca